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Radiation surrounding the moon


Published April 28, 2011


The purpose of the CRaTER instrument on LRO is to advance the understanding of Solar Cosmic Radiation (SCR) and Galactic Cosmic Radiation (GCR) in the lunar environment. Of special interest are the hazards they pose to humans and technological systems, and the physical processes which control their intensity and variability. The figure shows the daily-averaged absorbed dose rates measured by the two sets of CRaTER radiation detectors during the first 18 months of the LRO mission. The dates of the measurements are shown along the graph’s horizontal axis and the measured dose rate along on the vertical axis. The measured dose rates are influenced by the amount of material surrounding the individual detectors as well as factors that change with time such as the LRO orbiter altitude, solar wind modulation of the GCR particle flux, and sporadic intense increases in SCR during solar particle events. The dose rate decreased during the early mission as LRO moved closer to the moon, which provides protective shielding from GCR. Active eruptions on the surface of the Sun produce the short-term dramatic increases in SCR dose rates seen in more recent data. Credit: NASA/Goddard/University of New Hampshire


Mediatype image
Source http://www.nasa.gov/mission_pages/LRO/multimedia/lro-gal-crater.html
Licenseurl http://www.nasaimages.org/Terms.html
Date 2011-04-28
Identifier 540593main_crater_01
Addeddate 2012-01-26 19:27:59
Publicdate 2012-01-26 19:28:10

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